I’m a little surprised the police didn’t already know about that method. Seems like they’d encounter enough CCTV footage that’d it’d be standard training.
I once again overestimate the training levels of the police.
What they really want to say is “We aren’t interested in investigating your personal theft. Things get stolen all the time and we really can’t be bothered. You are not important to us.”
But they can’t say that, so they instead throw out some excuse that puts the onus back on the other person.
And Detective Conan Doyle O’Brien really did just let his bro fuck around and watch porn and even bring a stripper into the station during footage reviewing hours. Of course, Stuart was quite shocked to hear he was not invited to the stag do later that weekend
I dunno. “Don’t attribute to malice that which can be sufficiently explained by stupidity.” I can totally believe that the average police officer has not thought this through. “5 hours of footage! We don’t have 5 hours to look for one bike.”
It’s a somewhat narrow situation. You won’t always have the object of interest in plain view of a camera. What if it’s behind a door? Well now you do have to scrub through all the footage
The final project in my instrumentation class was to tune a PID controller for a hot/cold mixing valve. I (CS/ENG) was paired up with an engineering student and a lot of it was throwing parameters in, seeing if weird shit happened, and then turning down or up based on the result. I had a programming final and something else I was supposed to be studying for, so I just started doing a binary search with the knobs. We got the thing tuned relatively fast and my partner acted like I was a wizard.
How do you do a binary search for an open-end scale (are PID params open-end?) and three knobs at the same time when they interdepend in their influence? I need to know since i have a PID tuning on my personal projects plate
It’s been ages, but we’d done rough calculations for the three controls so we roughly knew what we needed. Our teacher was big on manually tuning instead of just using formulas since he thought just running numbers “lacked artfulness.”
So we grabbed a point and started searching around manually. I think we were just tuning the derivative portion at that point, trying to get a fast response without the system without it going chaotic and noisy.
Afterwards I found a chatroom thread among Cambridge computer scientists, one of whom had also been told that unless he could pin down the moment of theft no one would look at the footage. He said he had tried to explain sorting algorithms to police - he was a computer scientist, after all. You don’t watch the whole thing, he said. You use a binary search. You fast forward to halfway, see if the bike is there and, if it is, zoom to three quarters of the way through. But if it wasn’t there at the halfway mark, you rewind to a quarter of the way through. It’s very quick. In fact, he had pointed out, if the CCTV footage stretched back to the dawn of humanity it would probably have only taken an hour to find the moment of theft. This argument didn’t go down well.
This would be easier to parse with a monospaced font. I’m not sure how that works in lemmy so this might take an edit or two…
<span style="color:#323232;">
</span><span style="color:#323232;">round 1: L L L L R R R R — — — -
</span><span style="color:#323232;">
</span><span style="color:#323232;">round 2: L L R R R — — — L R L -
</span><span style="color:#323232;">
</span><span style="color:#323232;">round 3: L R R — — L R — L L — R```
</span>
Oh i get it. So if in round 1 it tilted down on the right. Round 2 it was even then round 3 it tilted down on the right then it was person G and they are heavier. However if it was reversed and tilted on the left then even then left then it was still person G but they are lighter. Because that pattern only occurs once. This is brilliant. Thankyou to you and the person you corrected the formatting of.
How do you solve that? I saw a solution in the comments where it says to start with numbering all the people and butting 1234 and 5678 on the see saw, then it says if they weight the same then continue and that seems to work. But if they dont weigh the same it doesnt work and it doesnt say what to do in that case.
That’s not the question. Either the scales balance, and the third is heavier or lighter, or the scales don’t balance and you get both answers, but the question is purposely framed this way
That’s easy enough to answer, but he really should work on his grammar. In that case you just do 3 groups of three, weigh two of them. If they’re even, the third group is different. Weigh 2 membres of the third group, they’ll either be even or one heavier. Weight the last member against the heavier one from step 2 to see if they’re even or not for your answer.
I’ve had a look into it, and it doesn’t work if you try to do it mathmatically. You always need more than 3 gos on the seesaw.
There is a solution in the replies to my original comment that is the actual solution, and it works every time and is much simpler than any grouping method.
It involves assigning a letter to each person and then aligning that with a grid of positions “left” or “right” or “none” on the seesaw. Over the three rounds. So, person A is on the right all three rounds person b is on the right for 2 rounds then on the left for the 3rd round.
You end up with a list of 12 patterns that do not repeat or mirror any other pattern like “LLL” “LLR” “LRR” “LR-” etc. Then you do all three rounds and compare the position the seesaw was in with those patterns.
If the seesaw was down on the left 2 times the down on the right the third time then you look for which person had that pattern in this case it was person B. So they are the one with a different weight and they were heavier.
Equally, if the opposite pattern occurred. It was down on the right 2 times, then down on the left for round, then that is the opposite pattern of person B and does not occur anywhere else, so it was person B, and they were lighter.
<span style="color:#323232;">person: A B C D E F G H I J K L
</span><span style="color:#323232;">
</span><span style="color:#323232;">round 1: L L L L R R R R — — — -
</span><span style="color:#323232;">
</span><span style="color:#323232;">round 2: L L R R R — — — L R L -
</span><span style="color:#323232;">
</span><span style="color:#323232;">round 3: L R R — — L R — L L — R
</span>
Yes, I’m aware. But with 12 people you can’t simply divvy the groups in threes constantly, because if you weigh and the groups are unequal, then you don’t know in which group the different person is (yet). E.g., weighing ABCD - EFGH can tell you the different person is in IJKL if the groups are even, but if they’re uneven you don’t know in which of the other two groups the different person is.
Sat on jury duty. We literally said not guilty because the officer was supposed to follow a process for line ups and they didn’t even do the bare minimum. They were like we got out guy
I once had a friend who was robbed of all kinds of stuff including a PS3, and that the guy was signed into his Netflix changing account profiles the very same day. I told him he can just get a tracking number by calling Playstation and that the active police officer can use it to track them. Thing is, the officer ghosted him for like 8 months despite having everything they needed to immediately find the exact location of the perpetrator actively using the stolen property.
They don’t care really. As has been my experience anyway.
I once had my car window smashed, a mix of gear taken…some was expensive, some was personal to me. I felt violated. Called the police, explained, gave S/Ns to what I could, told them exactly who did it. He didn’t give a shit. Actually made me feel like I was wasting his time. I think Seinfeld covered this…
“We’ll let you know if we find anything” “Do you ever find anything?” “No”
But oh, my reg is out of date and the plate scanner picked it up? Boom, they really kick it into gear. So that’s $130… i could just go take care of the tags immediately with a friendly warning but now don’t even want to. And in the end I end up pretty fucked.
If only they put that effort into other things I just might have gotten my linear power amps back. Props to anyone who knows that product.
I thought this had to be hyperbole, so I did the math myself. I’m assuming human history is 200,000 years as google says, and we want to narrow this down to the second the bike disappeared. also that the bike instantly vanished so there’s no partially existing bike.
each operation divides the time left in half, so to get from 200k years (6.311×10^12 seconds) to 1 would take ~42.58 divisions, call it 43. even if we take a minute on average to seek and decide whether the bike is there or not it would still be less than an hour of manual sorting
hell, at 60fps it would only take another 6 divisions to narrow it down to a single frame, still under an hour
edit: to use the entire hour we’d need a couple more universes worth of video time to sort through, 36.5 billion years worth to be exact. or a measly 609 million years if we need to find that single frame at 60fps
History is about 10k years, the 200k years is mostly pre-history. People didn’t write stuff down until they invented agriculture and needed to track trade between owners, workers, etc
My serial killer trait is that I use vi instead of vim cause I’m too lazy to type the extra character. Tho if for some reason, vi tab completed to vim, I’d probably use vim
I’m in DevOps so I’m in a lot of effemerial systems so in practice, I will run into systems where profile hasn’t been set up. Tho I do like the idea of making sure all systems properly have that aliased cause it’d be serial killer vibes to spend hours of time to make sure that I can save a keystroke.
Tho it’d never make it through PR. Also, wild require explaining to my coworkers that I do this
You can customize all the shortcuts and create custom ones. I’d recommend utilizing the leader key concept, and centering your keybindings around that. For text editing, just use evil-mode, once you build up muscle memory with those Vim bindings it’s just awesome.
By default they are not, but you can turn them into IDEs. In fact, you can turn them into better IDEs than stuff like IntelliJ or Visual Studio will ever be.
I’d need to run vi at least 5 times to have a net gain in saving keystrokes. I’m typically in effemerial systems created by the users of our env, so rarely am I going to gain those strokes back
But also, why am I trying to apply logic to this? I’ll often cat a file before editing it. This shit is just illogical idiosyncrasies I’ve picked up over the years. I’m probably creating posthoc justifications for insane things I do cause it’s hard to override muscle memory
There are different levels of effemeriality. The simplest example I use daily would be an autoscaling group in AWS. Especially if you use Spot Instances to save money, thi gs may scale in and out whenever.
So if a development team creates a new autoscaling group and I need to get into an instance to test something, unless I add stuff to their IaC, I’m stuck with their configuration. I need to assume that every time I ssh into one of those instances, it’s a brand new instance. But it’d be a big challenge for me to go to their repo and make a PR to alias a command whenever an instance in that resource is created
Stuff can be even more temporary if it’s something like an ECS task which creates a container with a read only filesystem only when a task is needed to be done. But I don’t want to get too deep in the weeds (or deeper than I already have)
terraform workspace will at least stick around for a while so you might be in and out of the same system multiple times.
You are missing out! I used to only use vim to edit config files. So I knew my way around (albeit, slowly). I installed the IdeaVim plugin a week ago and learned some new key bindings I wasn’t using. A week in I’m almost faster than before! And it’s only going to get better after I’ve acquired muscle memory (I’m nearly there.) and move on to complex key bindings/sequences. Then it will probably be as if the cursor is directly connected to my mind. I’m hopeful because I’ve seen a mentor of mine do it.
What am I missing out on? I use vi to change values in files on servers. What would you use for that task? Most of my other text-based work like writing Emails, taking notes or programming happens in Emacs.
I don’t think you understood what I said. I started using vim key bindings ALSO in my IDE and my speed improved because of it. I didn’t ask you to stop using vi. I merely suggested that you used MORE of it. If your Emacs setup already use vim keybindings that’s exactly what I’m doing too.
Oh thanks, now I got it. I agree, vi/vim bindings are awesome. I use them everywhere, in Emacs, in my shell, my browser, and in my tiling window manager. When I said, that I wouldn’t want to program in vi, I didn’t mean that because of the keybindings, I meant that because vi just lacks many useful features for programming and you can’t add plugins to it. I have programmed in Neovim for over a year though. Just switched to Emacs, because it has even more features, possibilities and customizability. I will never drop Vim keybindings though.
I use the fish shell. In fish, you can just add fish_vi_key_bindings to your config file and now Vi bindings will be automatically enabled when you start fish. For bash, it’s set -o vi and for zsh it’s bindkey -v. For the browser, you can install plugins like Vimium (Vimium-FF for Firefox) or Tridactyl. I find these to be incredibly useful, I love navigating around websites with j and k or d and u, jumping up with gg and down with G, searching with /, closing tabs with x, reloading websites with r, opening new tabs with t, going back and forward with H and L, etc.
I’ll have to check tomarrow if RHEL and UBI do this.
Did some quick googling and looks like cent has that alias by default but doesn’t do it when root. Which would explain why I do get inconsistent results with vi. I never thought about it in detail besides just knowing that there are some visual changes. Thanks for the info, I’ll be noticing this now that I know!
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